... 45#,4Cr Rail fastener high strength structural steel nut bolt I. Item:High strength bolts for steel structuresII. Specification: DIN 6914, DIN 6916 ... GB/T 1230 III. Usage:Supply to railway, highway, bridge, boiler with steel structure, industry workshop, high civil buildings, hoisting machinery and ... equipmentsWorkshop Welcome your visit! Rail fastener high strength structural steel nut bolt